Expected Availability: Summer 2018
- World’s first 20mm F1.4 lens, The 9-blade rounded diaphragm
- Two FLD “F” Low Dispersion glass and five SLD Special Low Dispersion
- Hyper Sonic Motor ensures high AF speed
- Brass bayonet mount
- Sigma USB Dock compatible
- 7 year Canadian Warranty
The 20mm F1.4 lens, is only possible through advances in large-diameter aspherical lens manufacturing technologies
To offer an ultra-wide-angle 20mm focal length and F1.4 brightness at a wide-open aperture, this lens incorporates a large double aspherical lens 59mm in diameter. Lenses of this type had been considered extremely difficult to manufacture, but Sigma took on the challenge to realize an F1.4 ultra-wide-angle lens that fulfills the strict performance requirements of the Sigma Art line. What made this breakthrough possible were Sigma’s advanced manufacturing technologies, which the company has developed over time by producing a wide range of ultra-wide-angle and large-aperture lenses.
Minimized chromatic aberrations
This lens minimizes chromatic aberrations, a common issue in large-aperture ultra-wide-angle lenses. It features two FLO (“F” Low Dispersion)* glass and five SLD (Special Low Dispersion} glass elements to minimize transverse chromatic aberration, which is mainly visible around the edge of the image. The optimized lens power distribution helps minimize axial chromatic aberration. As a result, this lens delivers high image quality in every situation without color smearing, and its rendering performance is consistently sharp with high contrast.
Distortion is a common issue in wide-angle lenses, and it is not possible to correct it simply by changing the aperture value. For this reason, a lens must be designed from the start to minimize this issue. By adjusting the incidence angle of light starting with the first lens element and incorporating optimally positioned aspherical glass elements, the Sigma 20mm F1.4 DG HSM | Art lens minimizes distortion throughout the entire image.
Hyper Sonic Motor ensures high AF speed
The Hyper Sonic Motor (HSM) ensures silent, high-speed autofocusing, while the optimized AF algorithm helps realize even smoother AF performance. At any time during AF, users may access MF by simply rotating the focus ring. This feature makes faster focus adjustment possible, since there is no need to use the AF/MF focus mode switch.
Brass bayonet mount
A specially treated brass bayonet mount ensures maximum precision, greater strength, and superior durability for long-term use.